This a video showing how to replace the rear door glass on your own instead of going to a shop.
How to remove rear door glass on a chevy tracker.
93 chevy 4x4 door removal.
Remove the door panel push pins and trim screws.
Lift the door panel up and out to release the door panel locking tabs.
Remove all door panel electrical connectors.
By removing the motor if applicable and unbolting the regulator from the door it can be removed.
Sorry for the video was bad but i made a quick one of how to do it since i could really find it myself so i had to do it on my own hopefully this helps someo.